Root for Primo Gm #downlad the app : https://drive.google.com/file/d/0B7UY1BKKGuc-WWRqQlJfdUJOVUU/view?usp=sharing
This is actually kingroot app. If you have it then no need to download
install the app in your phone. open it, click on the big green button and wait till a tick mark appears. You are done. Phone is rooted now.
Download mobile uncle tools from google playstore.
#Download the recovery :https://drive.google.com/file/d/0B7UY1BKKGuc-djBKdzVZaDNYMTg/view?usp=sharing
place it in your phone's memory not in sd card. Open mobile uncle tools.Flash recovery from there. then reboot to recovery from mobile uncle tool to check if you are successful.